Phase-nulling radiation comparison system



April l 1958 M. E. GOLAY PHASNULLNG RADATON COMPARSON SYSTEM F1ed Nov. 12 1954 5 Sheetssheet Signals from a predetermined phase relationship, means responsive to said Signal for adjusting the phase f Said reference signal to maintain Said predeterInined phase Telationship, Whereby the amount of said phase adjustment is a difect measure 0f the Tatio of intensity of said two bean13 14' In a radiation con1parison systen1, means for generating iil'st and second bean]s Of radiation, nleans f01 directing Said bearns on a c0mmon path, Said laSt-nan1ed means being operative at the frequency in accordance With a threeeriod cycle including a period during Which said rst beam is passed and said Second beam is blocked, a period during which said TSt beam is bcked and said Second beam is passed, and a period during which both Said bean18 are blocked, nleans for generating a feference Signal at tlle frequency radiati0T1-Sensitive means p0Siti0nd il1 Said common ath for producing a Signal commensurate With the intensity 0f the radiation impinging thereon, phase detector Ineans connected to Teceive Said Teference Signal and said radiation intensity Signal for roducing a Signal aS a ftlt1ction of the Telative phase therebetween, Whereby said lastnamed Signal is a Ineasure 0f the ratio of intensity of said tWO beanls l...eferences (:ited iIl the 1e of this )atent UNITED STATES PATENTS 2,Z66,607 Kaufmann Dec. 16, 1941 Z'S49 40Z Vossber A r. 17, 1951 Z 6Sl77l Palmer Se t 8, 1953 2,679,010 Luft Ma 18 1954 Z 679 Atwood Ma 25, 1954 

